The size() is an inbuilt method in jQuery used to find the number of elements matched by the given selector. This method is removed in jQuery 3.0 instead of this length() has been introduced.
Parameter: It does not accept any parameters.
Return Value: It returns the number of elements matched by the selected elements.
jQuery code to show the working of size() method:
Before clicking on the screen-
After clickiing three times on the screen-